Hi Fred.
Good luck on your search. I only have an A1200 for sale which doesn't have a working IDE port, so it's only a floppy based system. So it's ok for a games machine.
You realize, that the "latest games" were mostly AGA dependent, so that precludes using the A500 and A3000, but since there's tons of games you can get for a classic system, well, go for it.
The closest dealer to you, is a store in Boise Idaho, which you can get the links below in the dealers section. Otherwise, its softhut in Pennsylvania, and Magnetic Systems in NY. If you want to stick to the USA that is. OldSoftware has games too, but the prices tend to be little high.